BK 3,7
The Bordkanone 3,7 (BK 3,7) ("on-board cannon 3.7") was a German 3.7 cm (1.46 in) anti-tank/bomber autocannon of World War II and based on the earlier 3.7 cm (1.46 in) 3.7 cm Flak 18 made by Rheinmetall.
| BK 3,7 | |
|---|---|
Hans-Ulrich Rudel's Junkers Ju 87G, with twin BK 3,7 gun pods attached to the underside of the wings, in Russia 1943. | |
| Type | Aircraft mounted auto-cannon |
| Place of origin | Germany |
| Service history | |
| In service | 1942–1945 |
| Used by | Axis powers |
| Wars | World War II |
| Production history | |
| Manufacturer | Rheinmetall-Borsig |
| Specifications | |
| Mass | 295 kg (650 lb) |
| Length | 3,750 mm (12 ft 4 in) |
| Barrel length | 2,106 mm (6 ft 10.9 in) |
| Cartridge | 37×263mmB |
| Cartridge weight | (Shell only) APCR 405 g (14.3 oz) HE 640 g (23 oz) AT 680 g (24 oz) |
| Caliber | 37 mm (1.46 in) |
| Barrels | 1 |
| Action | Short recoil |
| Rate of fire | 160 rpm |
| Muzzle velocity | 1,140–800 metres per second (3,700–2,600 ft/s) |
| Effective firing range | 500 m (550 yd) |
It was mounted on Luftwaffe aircraft such as the Junkers Ju 87 G-1 and G-2; Henschel Hs 129B-2/R3; Messerschmitt Bf 110G-2/R1-3; Junkers Ju 88P-2 or P-3 and others. The cannon could be attached under the wings or the fuselage of the aircraft as self-contained gun pods with 12-round magazines. It fired Armour Piercing Composite Rigid (APCR, Tungsten-cored) ammunition or high-explosive shells at 160 rounds per minute.
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